View Full Version : Hubble Looks at Sedna

2005-Sep-07, 06:10 PM
SUMMARY: After the announcement of Sedna last month, the solar system's furthest object, astronomers have had the opportunity to look at it better with the Hubble Space Telescope. Sedna's discoverer, Mike Brown from Caltech, was sure it also had a moon, but these new observations didn't turn anything up. This is unusual because Sedna's rotation takes 20 days instead of a few hours like most other asteroids - usually it's a moon that slows down an object's rotation. Based on Hubble's observations, astronomers believe Sedna is no larger than 1,770 km across (3/4 the size of Pluto).

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